Print is not clear

I have the dell 1720dn printer, it prints but the print is not clear like the faded or something and there are some dark spots appearing on the paper while taking prints. is there any way i can fix or clean any part of it?

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Change your toner cartridge. A properly working toner cartridge will never leave that much toner lying around. The white lines are an indication that either the toner is low, or the mag roller is defective.

If you do several test pages it should eventually clear up. If you get new Dell cartridges this will likely go away immediately. Dell carts have a tendency to "sludge up" if the printer remains idle too long, so print something every other day. Also, don't use refilled Dell carts, they may be good at first, but they are old and usually never last long as they should.

Check that the correct printer is set as default. Also use File Print so that the selected printer is shown rather than using the Print button. If the test pages are being printed from the computer then the communication is working.

If the issue is occuring in the same place on all prints, try the imaging drum (can't remember if this printer even uses one) or the transfer belt/roller (not sure which it uses). If you phone Dell support, they should run you through troubleshooting and send you either of those parts free of charge if you are under warranty. If not, buy them anyways; they don't degrade over time (if kept in the dark) and can be saved for when the currently installed one runs out if you don't need it to fix this issue.